fuel problem?

think my 340 dart w/ highrise and 750 holly is feeling sluggish at full throttle starts. usually boils the hides but really isn't. i've got a PRESSURE gauge in the fuel line that i think read about 6 to 7 lbs at idle. now the needle on the gauge is bouncing all over the place at idle. fuel problem? carb? fuel pump? any help out there? thanks